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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d84103d9193d3b1578e1d4917746bb85e28df647dd3bb1270e680a36700e68' 
  AND token = 'iry8dV+e9Z4YnTBaW0zLSNS0Os1xl7suYbLQ756CaV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}